If you've got a Holley blue, what you heard from whoever about gravity feeding is correct... to mount it at or below fuel tank level, because it's a "pusher" pump more-so than a "puller". Tank exit lines up, down, or sideways, no issue, rubber line bends... steel lines can be bent too...
Fairly certain there's no "pusher" in-tank electric fuel pump in a 1980...
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